Quality Fleet Services in the denver metro area

Harmon Diesel offers a complete range of fleet and truck repair or maintenance services to keep your vehicle running smooth and safely. From routine checkups to diagnostics, Harmon Diesel ensures expert care for most makes and models.

Services

Harmon Diesel provides mobile diesel repair and on-site fleet maintenance care to keep you performing at your best. From routine servicing to complex repairs, our experts deliver fast, reliable, and quality workmanship.

Fleet Maintenance Service

Proactive maintenance programs designed to keep your fleet reliable, compliant, and operating at peak performance. On-site preventative maintenance (PM services).

Brake Repair

Thorough brake inspections and repairs to ensure safe, responsive stopping power.

Suspension Repair

Minor suspension repairs to improve ride quality, handling, and stability. Services include shocks, airbags, leaf springs, U-bolts, air leaks, and ride height adjustments. Please note we do not offer alignments.

Check Engine Light Diagnostics

Accurate diagnostics to quickly identify and resolve check engine light issues, minimizing downtime. We also offer forced regens / after treatment repairs.

Engine Repair

Minor to moderate engine repairs to restore performance and help prevent costly breakdowns. Services include preventative maintenance, belts, sensors, radiators, fuel system services, alternators, exhaust manifolds, and turbo replacements.

DOT Inspection

Comprehensive DOT inspections to ensure your vehicles meet all safety and compliance standards, along with repairs to correct any violations.

Electrical Repair

Electrical diagnostics & repair. Services include batteries, starters, alternators, and minor repairs.

roadside service

Breakdown service and emergency repairs. We offer charging system repairs, jump starts, minor air system repairs, and check engine light diagnostics.

cooling system service

Comprehensive cooling system services for semi trucks, including radiator inspection, coolant flush and replacement, hose and belt checks, and system pressure testing to prevent overheating and costly downtime.

Need a Service Call Assistance?

Have a truck that needs immediate attention. Our team is ready during business hours anytime with quick, reliable assistance.
From jump-starts to diagnostics, we ensure you get back on the road safely and without stress.